| /* |
| * Copyright (c) 1996, 2003 VIA Networking Technologies, Inc. |
| * All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * |
| * File: dpc.c |
| * |
| * Purpose: handle dpc rx functions |
| * |
| * Author: Lyndon Chen |
| * |
| * Date: May 20, 2003 |
| * |
| * Functions: |
| * |
| * Revision History: |
| * |
| */ |
| |
| #include "dpc.h" |
| #include "device.h" |
| #include "mac.h" |
| #include "baseband.h" |
| #include "rf.h" |
| |
| int vnt_rx_data(struct vnt_private *priv, struct vnt_rcb *ptr_rcb, |
| unsigned long bytes_received) |
| { |
| struct ieee80211_hw *hw = priv->hw; |
| struct ieee80211_supported_band *sband; |
| struct sk_buff *skb; |
| struct ieee80211_rx_status rx_status = { 0 }; |
| struct ieee80211_hdr *hdr; |
| __le16 fc; |
| u8 *rsr, *new_rsr, *rssi, *frame; |
| __le64 *tsf_time; |
| u32 frame_size; |
| int ii, r; |
| u8 *rx_sts, *rx_rate, *sq, *sq_3; |
| u32 wbk_status; |
| u8 *skb_data; |
| u16 *pay_load_len; |
| u16 pay_load_with_padding; |
| u8 rate_idx = 0; |
| u8 rate[MAX_RATE] = {2, 4, 11, 22, 12, 18, 24, 36, 48, 72, 96, 108}; |
| long rx_dbm; |
| |
| skb = ptr_rcb->skb; |
| |
| /* [31:16]RcvByteCount ( not include 4-byte Status ) */ |
| wbk_status = *((u32 *)(skb->data)); |
| frame_size = wbk_status >> 16; |
| frame_size += 4; |
| |
| if (bytes_received != frame_size) { |
| dev_dbg(&priv->usb->dev, "------- WRONG Length 1\n"); |
| return false; |
| } |
| |
| if ((bytes_received > 2372) || (bytes_received <= 40)) { |
| /* Frame Size error drop this packet.*/ |
| dev_dbg(&priv->usb->dev, "------ WRONG Length 2\n"); |
| return false; |
| } |
| |
| skb_data = (u8 *)skb->data; |
| |
| rx_sts = skb_data+4; |
| rx_rate = skb_data+5; |
| |
| /* real Frame Size = USBframe_size -4WbkStatus - 4RxStatus */ |
| /* -8TSF - 4RSR - 4SQ3 - ?Padding */ |
| |
| /* if SQ3 the range is 24~27, if no SQ3 the range is 20~23 */ |
| |
| pay_load_len = (u16 *) (skb_data + 6); |
| |
| /*Fix hardware bug => PLCP_Length error */ |
| if (((bytes_received - (*pay_load_len)) > 27) || |
| ((bytes_received - (*pay_load_len)) < 24) || |
| (bytes_received < (*pay_load_len))) { |
| dev_dbg(&priv->usb->dev, "Wrong PLCP Length %x\n", |
| *pay_load_len); |
| return false; |
| } |
| |
| sband = hw->wiphy->bands[hw->conf.chandef.chan->band]; |
| |
| for (r = RATE_1M; r < MAX_RATE; r++) { |
| if (*rx_rate == rate[r]) |
| break; |
| } |
| |
| priv->rx_rate = r; |
| |
| for (ii = 0; ii < sband->n_bitrates; ii++) { |
| if (sband->bitrates[ii].hw_value == r) { |
| rate_idx = ii; |
| break; |
| } |
| } |
| |
| if (ii == sband->n_bitrates) { |
| dev_dbg(&priv->usb->dev, "Wrong RxRate %x\n", *rx_rate); |
| return false; |
| } |
| |
| pay_load_with_padding = ((*pay_load_len / 4) + |
| ((*pay_load_len % 4) ? 1 : 0)) * 4; |
| |
| tsf_time = (__le64 *)(skb_data + 8 + pay_load_with_padding); |
| |
| priv->tsf_time = le64_to_cpu(*tsf_time); |
| |
| if (priv->bb_type == BB_TYPE_11G) { |
| sq_3 = skb_data + 8 + pay_load_with_padding + 12; |
| sq = sq_3; |
| } else { |
| sq = skb_data + 8 + pay_load_with_padding + 8; |
| sq_3 = sq; |
| } |
| |
| new_rsr = skb_data + 8 + pay_load_with_padding + 9; |
| rssi = skb_data + 8 + pay_load_with_padding + 10; |
| |
| rsr = skb_data + 8 + pay_load_with_padding + 11; |
| if (*rsr & (RSR_IVLDTYP | RSR_IVLDLEN)) |
| return false; |
| |
| frame_size = *pay_load_len; |
| |
| vnt_rf_rssi_to_dbm(priv, *rssi, &rx_dbm); |
| |
| priv->bb_pre_ed_rssi = (u8)rx_dbm + 1; |
| priv->current_rssi = priv->bb_pre_ed_rssi; |
| |
| frame = skb_data + 8; |
| |
| skb_pull(skb, 8); |
| skb_trim(skb, frame_size); |
| |
| rx_status.mactime = priv->tsf_time; |
| rx_status.band = hw->conf.chandef.chan->band; |
| rx_status.signal = rx_dbm; |
| rx_status.flag = 0; |
| rx_status.freq = hw->conf.chandef.chan->center_freq; |
| |
| if (!(*rsr & RSR_CRCOK)) |
| rx_status.flag |= RX_FLAG_FAILED_FCS_CRC; |
| |
| hdr = (struct ieee80211_hdr *)(skb->data); |
| fc = hdr->frame_control; |
| |
| rx_status.rate_idx = rate_idx; |
| |
| if (ieee80211_has_protected(fc)) { |
| if (priv->local_id > REV_ID_VT3253_A1) { |
| rx_status.flag |= RX_FLAG_DECRYPTED; |
| |
| /* Drop packet */ |
| if (!(*new_rsr & NEWRSR_DECRYPTOK)) { |
| dev_kfree_skb(skb); |
| return true; |
| } |
| } |
| } |
| |
| memcpy(IEEE80211_SKB_RXCB(skb), &rx_status, sizeof(rx_status)); |
| |
| ieee80211_rx_irqsafe(priv->hw, skb); |
| |
| return true; |
| } |